My driver-side window is "loose" in its track when it is down. Both driver and passenger windows rattle a bit when you close them when they are down, but there is a lot more play on the driver-side. Anybody know where this slack might be coming from and how to tighten it up?

 

Probably need to pull the door panel and investigate. On my car a while back the rear window track had broken a tab off, I was able to get a used one from Jim at a fair price. It's a bolt-on track, it's easy to swap out.

Could be something else but you'll need to pull the door panel and do some investigating.

Dale